Light source device and display device

Abstract

There is provided a light source device including a first light source configured to emit light in a first wavelength region, a second light source configured to emit light in a second wavelength region different from the first wavelength region, a wavelength conversion unit including a fluorescent material and configured to emit fluorescent emission light in a different wavelength region upon irradiation with the light in the first wavelength region, and a combining unit that has wavelength selectivity to a specific wavelength region corresponding to the second wavelength region and combines the light in the first wavelength region from the first light source, the light in the second wavelength region from the second light source, and the fluorescent emission light which are incident on the combining unit with one another.

What is claimed is: 
     
       1. A light source device, comprising:
 a first light source configured to emit light in a first wavelength region; 
 a second light source configured to emit light in a second wavelength region different from the first wavelength region; 
 a wavelength conversion unit that includes a fluorescent material and is configured to emit fluorescent emission light in a third wavelength region, different from the first wavelength region and the second wavelength region, upon irradiation with the light in the first wavelength region, 
 wherein the light emitted from the first light source is reflected by the wavelength conversion unit that includes the fluorescent material, wherein the light reflected by the wavelength conversion unit is in the third wavelength region; 
 a combining unit that comprises wavelength selectivity to a specific wavelength region that corresponds to the second wavelength region and is configured to combine the light in the first wavelength region emitted from the first light source, the light in the second wavelength region emitted from the second light source, and the fluorescent emission light which are incident on the combining unit; 
 a first fluorescent light reflection unit between the first light source and the wavelength conversion unit, 
 wherein the first fluorescent light reflection unit is configured to allow the light in the first wavelength region to pass through and reflect the fluorescent emission light; and 
 a second fluorescent light reflection unit different from the first fluorescent light reflection unit, 
 wherein the second fluorescent light reflection unit is configured to
 allow the light in the first wavelength region and the fluorescent emission light reflected from the first fluorescent light reflection unit to pass through, and 
 reflect the light in the second wavelength region. 
 
 
     
     
       2. The light source device according to  claim 1 ,
 wherein the light in the first wavelength region emitted from the first light source, the light in the second wavelength region, and the fluorescent emission light are combined on a same axis. 
 
     
     
       3. The light source device according to  claim 1 ,
 wherein the wavelength conversion unit is further configured to be rotatable on a plane which crosses an incident direction of the light of the first light source. 
 
     
     
       4. The light source device according to  claim 1 ,
 wherein the first wavelength region is a blue wavelength region. 
 
     
     
       5. The light source device according to  claim 1 ,
 wherein the second wavelength region is a red wavelength region. 
 
     
     
       6. The light source device according to  claim 1 ,
 wherein at least one of the first light source or the second light source is a laser diode. 
 
     
     
       7. The light source device according to  claim 1 , wherein the fluorescent material is a YAG-based fluorescent material. 
     
     
       8. A light source device, comprising:
 a first light source configured to emit light in a first wavelength region; 
 a second light source configured to emit light in a second wavelength region different from the first wavelength region; 
 a wavelength conversion unit that includes a fluorescent material and is configured to emit fluorescent emission light in a third wavelength region, different from the first wavelength region and the second wavelength region, upon irradiation with the light in the first wavelength region, 
 wherein the light emitted from the first light source is reflected by the wavelength conversion unit that includes the fluorescent material, wherein the light reflected by the wavelength conversion unit is in the third wavelength region; 
 a combining unit that comprises wavelength selectivity to a specific wavelength region that corresponds to the first wavelength region and the second wavelength region and is configured to combine the light in the first wavelength region emitted from the first light source, the light in the second wavelength region emitted from the second light source, and the fluorescent emission light which are incident on the combining unit; 
 a first fluorescent light reflection unit between the first light source, and the wavelength conversion unit, 
 wherein the first fluorescent light reflection unit is configured to allow the light in the first wavelength region to pass through and reflect the fluorescent emission light; and 
 a second fluorescent light reflection unit different from the first fluorescent light reflection unit,
 wherein the second fluorescent light reflection unit is configured to 
 allow the light in the first wavelength region and the fluorescent emission light reflected from the first fluorescent light reflection unit to pass through, and 
 reflect the light in the second wavelength region. 
 
 
     
     
       9. The light source device according to  claim 8 , wherein the fluorescent material is a YAG-based fluorescent material. 
     
     
       10. A display device, comprising:
 a light source unit; 
 a light modulating/combining system configured to modulate and combine incident light; 
 an illumination optical system configured to guide light emitted from the light source unit to the light modulating/combining system; and 
 a projection optical system configured to project an image emitted from the light modulating/combining system, 
 wherein the light source unit comprises:
 a first light source configured to emit light in a first wavelength region; 
 a second light source configured to emit light in a second wavelength region different from the first wavelength region; 
 a wavelength conversion unit that includes a fluorescent material and is configured to emit fluorescent emission light in a third wavelength region, different from the first wavelength region and the second wavelength region, upon irradiation with the light in the first wavelength region, 
 wherein the light emitted from the first light source is reflected by the wavelength conversion unit that includes the fluorescent material, wherein the light reflected by the wavelength conversion unit is in the third wavelength region; 
 a combining unit that comprises wavelength selectivity to a specific wavelength region that corresponds to the second wavelength region and is configured to combine the light in the first wavelength region emitted from the first light source, the light in the second wavelength region emitted from the second light source, and the fluorescent emission light which are incident on the combining unit; 
 a first fluorescent light reflection unit between the first light source and the wavelength conversion unit, 
 wherein the first fluorescent light reflection unit is configured to allow the light in the first wavelength region to pass through and reflect the fluorescent emission light; and 
 
 a second fluorescent light reflection unit different from the first fluorescent light reflection unit,
 wherein the second fluorescent light reflection unit is configured to 
 allow the light in the first wavelength region and the fluorescent emission light reflected from the first fluorescent light reflection unit to pass through, and 
 reflect the light in the second wavelength region. 
 
 
     
     
       11. The display device according to  claim 10 , wherein the fluorescent material is a YAG-based fluorescent material. 
     
     
       12. A display device, comprising:
 a light source unit; 
 a light modulating/combining system configured to modulate and combine incident light; 
 an illumination optical system configured to guide light emitted from the light source unit to the light modulating/combining system; and 
 a projection optical system configured to project an image emitted from the light modulating/combining system, 
 wherein the light source unit comprises:
 a first light source configured to emit light in a first wavelength region; 
 a second light source configured to emit light in a second wavelength region different from the first wavelength region; 
 a wavelength conversion unit that includes a fluorescent material and is configured to emit fluorescent emission light in a third wavelength region, from the first wavelength region and the second wavelength region, upon irradiation with the light in the first wavelength region, 
 wherein the light emitted from the first light source is reflected by the wavelength conversion unit that includes the fluorescent material, wherein the light reflected by the wavelength conversion unit is in the third wavelength region; 
 a combining unit that comprises wavelength selectivity to a specific wavelength region that corresponds to the first wavelength region and the second wavelength region and is configured to combine the light in the first wavelength region emitted from the first light source, the light in the second wavelength region emitted from the second light source, and the fluorescent emission light which are incident on the combining unit; 
 a first fluorescent light reflection unit between the first light source and the wavelength conversion unit, 
 wherein the first fluorescent light reflection unit is configured to allow the light in the first wavelength region to pass through and reflect the fluorescent emission light; and 
 
 a second fluorescent light reflection unit different from the first fluorescent light reflection unit,
 wherein the second fluorescent light reflection unit is configured to 
 allow the light in the first wavelength region and the fluorescent emission light reflected from the first fluorescent light reflection unit to pass through, and 
 reflect the light in the second wavelength region. 
 
 
     
     
       13. The display device according to  claim 12 , wherein the fluorescent material is a YAG-based fluorescent material.